head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, and it is a single point.

Execution · Competitive PvP
Football sim testing execution and opponent reading under a studied tactical meta.

Execution · Competitive PvP
Artillery aim and turn planning against humans under wind and crate randomness.
FIFA 21 leans Execution (Competitive PvP); Worms Reloaded leans Execution (Competitive PvP).
FIFA 21 leans a little harder on execution, though the gap is small.
FIFA 21
Skill moves and finishing mechanics demand practiced hands
Worms Reloaded
Grenade arcs and ninja-rope shots demand fine aim control
FIFA 21 leans a little harder on reads, though the gap is small.
FIFA 21
Outguessing a human's defensive shape and attacking patterns is central
Worms Reloaded
Anticipating human opponents' target priorities shifts each turn
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
FIFA 21
Deflections, finishing RNG and pack luck colour outcomes
Worms Reloaded
Random terrain, crates and wind perturb every shot
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
FIFA 21
Meta formations, custom tactics and squad building are studied deeply
Worms Reloaded
Weapon economy and positioning theory reward planning
A matching score does not mean a matching test. Two games can both sit at 10 on execution and demand completely different things of you - which is why the reasoning above matters more than the number beside it.